nix-reuse/README.md

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<!--
SPDX-FileCopyrightText: 2024 Tom Hubrecht <tom.hubrecht@dgnum.eu>
SPDX-License-Identifier: EUPL-1.2
-->
# Integration of [Forgejo](https://forgejo.org/docs/latest/user/actions/)/[Gitea](https://docs.gitea.com/usage/actions/overview)/[GitHub](https://docs.github.com/en/actions/writing-workflows) workflows with [Nix](https://lix.systems/)
## Features
- Provides checked workflow files thanks to [action-validator](https://github.com/mpalmer/action-validator)
- You can use all the power of Nix to declare workflows: `genAttrs`, `readDir`, ...
## Getting started
### npins
1. Add `nix-actions` to your sources:
```bash
npins add git https://git.dgnum.eu/DGNum/nix-actions
```
2. Integrate workflows to `shell.nix`:
```nix
let
sources = import ./npins;
workflows = (import sources.nix-actions { }).install {
src = ./.;
workflows.build = {
name = "Build something";
on = [ "push" ];
...
};
};
in
with (import sources.nixpkgs { });
mkShell {
packages = [ ... ];
inherit (workflows) shellHook;
}
```
### Options
- `src`: the root of the project, required for the workflows checks
- `platform`: one of `forgejo`, `gitea`, or `github`, this will impact the location of the installed workflow files. Defaults to `forgejo`.
- `removeUnknown`: whether to remove workflow files not created by `nix-actions`. Defaults to `true`.
### Ensuring all workflows are up to date
Simply add a new workflow for this !
```nix
{
name = "Check workflows";
on = [
"pull_request"
"push"
];
jobs = {
check_workflows = {
runs-on = "nix";
steps = [
{ uses = "actions/checkout@v3"; }
{
name = "Check that the workflows are up to date";
run = "nix-shell --run '[ $(git status --porcelain | wc -l) -eq 0 ]'";
}
];
};
};
}
```
## Examples
The main example is used by the DGNum infrastructure, workflows are defined in https://git.dgnum.eu/DGNum/infrastructure/src/branch/main/workflows .
Be aware that the runners used there are a bit funky and already come with Lix installed (c.f. https://git.hubrecht.ovh/hubrecht/nix-modules/src/branch/main/services/forgejo-nix-runners/default.nix ).